Sexual eukaryotic organisms are characterized by an alternation between haploid and diploid phases. In vascular plants and animals, somatic growth and development occur primarily in the diploid phase, with the haploid phase reduced to the gametic cells. In many other eukaryotes, however, growth and development occur in both phases, with substantial variability among organisms in the length of each phase of the life cycle. A number of theoretical models and experimental studies have shed light on factors that may influence life (...) cycle evolution, yet we remain far from a complete understanding of the diversity of life cycles observed in nature. In this paper we review the current state of knowledge in this field, and touch upon the many questions that remain unanswered. BioEssays 20:453–462, 1998. © 1998 John Wiley & Sons, Inc. (shrink)

Genetic variation in fitness is the fundamental prerequisite for adaptive evolutionary change. If there is no variation in survival and reproduction or if this variation has no genetic basis, then the composition of a population will not evolve over time. Consequently, the factors influencing genetic variation in fitness have received close attention from evolutionary biologists. One key factor is the mode of reproduction. Indeed, it has long been thought that sex enhances fitness variation and that this explains the ubiquity of (...) sexual reproduction among eukaryotes. Nevertheless, theoretical studies have demonstrated that sex need not always increase genetic variation in fitness. In particular, if fitness interactions among beneficial alleles (epistasis) are positive, sex can reduce genetic variance in fitness. Empirical data have been sorely needed to settle the issue of whether sex does enhance fitness variation. A recent flurry of studies1-4 has demonstrated that sex and recombination do dramatically increase genetic variation in fitness and consequently the rate of adaptive evolution. Interpreted in light of evolutionary theory, these studies rule out positive in these experiments epistasis as a major source of genetic associations. Further studies are needed, however, to tease apart other possible sources. BioEssays 25:533–537, 2003. © 2003 Wiley Periodicals, Inc. (shrink)

Few topics have intrigued biologists as much as the evolution of sex. Understanding why sex persists despite its costs requires not just rigorous theoretical study, but also empirical data on related fundamental issues, including the nature of genetic variance for fitness, patterns of genetic interactions, and the dynamics of adaptation. The increasing feasibility of examining genomes in an experimental context is now shedding new light on these problems. Using this approach, McDonald et al. recently demonstrated that sex uncouples beneficial and (...) deleterious mutations, allowing selection to proceed more effectively with sex than without. Here we discuss the insights provided by this study, along with other recent empirical work, in the context of the major theoretical models for the evolution of sex. (shrink)

In this stimulating book, six leading philosophers--Karl-Otto Apel, Robert Brandom, Karsten Harries, Martha Nussbaum, Barry Stroud, and Allen Wood--consider the nature of philosophy. Although each of them has a unique perspective, they all seem to agree that philosophy seeks to uncover hidden assumptions and concepts in order to expose them to critical scrutiny. It is thus entirely fitting that philosophers should examine their own assumptions about the nature of their discipline. As they delve into the nature of philosophy, the (...) authors address many fascinating subjects: what makes philosophy different from natural science, religion, and other branches of the humanities; whether philosophy can contribute to political transformation, and if so, how; whether there can ever be an "end of philosophy"; and more. The editors' introduction ties together the contributors' diverse perspectives by noting common themes, similarities, and differences. (shrink)

In the current literature, institutional adoption of Corporate Social Responsibility (CSR) governance standards is mainly understood in a binary sense (adoption versus no adoption), and existing research has hitherto focused on inducements as well as on barriers of related organizational change. However, little is known about often invisible internal adoption patterns relating to institutional entrepreneurship in the field of CSR. At the same time, additional information about these processes is relevant in order to systematically assess the outcomes of institutional entrepreneurship (...) and to differentiate between substantive versus symbolic implementation. In this paper, we contribute a comparative intraorganizational differentiation of institutional adoption processes in the field of CSR, and we distinguish between broad and narrow organizational institutional adoption across different management functions relating to institutions of a similar type. Our study is based on a quantitative survey among members of the United Nations Global Compact Network Germany, as well as on qualitative interviews. We analyze different institutional adoption patterns and derive ten theoretical predictors of diverse institutional adoption choices and thereby inform the literatures on institutional entrepreneurship, CSR governance, and Multi-Stakeholder Initiatives. Besides our theoretical contributions, our findings serve as a source of information for practitioners engaged in CSR governance as they provide new insights into the managerial perception and assessment of different CSR standards and initiatives. (shrink)

Through the lens of the Health Belief Model and Protection Motivation Theory, we analyzed interviews of 36 agricultural advisors in Indiana and Nebraska to understand their appraisals of climate change risk, related decision making processes and subsequent risk management advice to producers. Most advisors interviewed accept that weather events are a risk for US Midwestern agriculture; however, they are more concerned about tangible threats such as crop prices. There is not much concern about climate change among agricultural advisors. Management practices (...) that could help producers adapt to climate change were more likely to be recommended by conservation and Extension advisors, while financial and crop advisors focused more upon season-to-season decision making. We contend that the agricultural community should integrate long-term thinking as part of farm decision making processes and that agricultural advisors are in a prime position to influence producers. In the face of increasing extreme weather events, climatologists and advisors should work more closely to reach a shared understanding of the risks posed to agriculture by climate change. (shrink)

In this paper, I examine some of the presuppositions that underpin the practice and interpretation of multi-person dialogue – that is, in contexts involving more than two interlocutors – with particular thought for the university seminar. I outline the ‘dialogical phenomenology’ of Beata Stawarska as useful on this count; however, I argue that Stawarska’s account is steeped in a philosophical ‘dyadic paradigm’ which has limiting consequences for practitioners of dialogue looking to understand the nature of dialogue in a group context. (...) Against this paradigm, I argue that there are many varieties of intersubjectivity that have not been widely discussed, including we-you, we-yous, I-yous and we-they intersubjective structures. I will look further at how an understanding of these structures is valuable for dialogue within educational praxes and for the Humanities more broadly. (shrink)

Urban and agricultural communities are interdependent but often differ on approaches for improving water quality impaired by nutrient runoff waterbodies worldwide. Current water quality governance involves an overlapping array of policy tools implemented by governments, civil society organizations, and corporate supply chains. The choice of regulatory and voluntary tools is likely to influence many dimensions of the relationship between urban and agricultural actors. These relationships then influence future conditions for collective decision-making since many actors participate for multiple years in water (...) quality improvement. In this policy analysis, we draw on our professional experiences and research, as well as academic and practitioner literatures, to investigate how different types of water quality interventions influence urban-agricultural relationships, specifically examining policy tools on a regulatory to voluntary spectrum. Interactions between farmers and other rural agricultural interests on one hand, and urban residents and their stormwater managers and wastewater treatment plants on the other, influence dynamics relevant for water quality improvement. We suggest that the selection of policy tools within complex governance contexts influence urban–agricultural relationships through financial exchange, political coalitions, knowledge exchange, interpersonal relationships, and shared sense of place. Policy tools that provide a means to build relationships and engage with people’s emotions and identities have potential to influence personal and community change and adaptive capacity, while processes such as lawsuits can catalyze structural change. Engaging these relationships is particularly critical given the need to move out of polarized positions to solve collective problems. (shrink)

Many studies have argued for distinct but complementary contributions from each hemisphere in the control of movements to visual targets. Investigators have attempted to extend observations from patients with unilateral left- and right-hemisphere damage, to those using neurologically-intact participants, by assuming that each hand has privileged access to the contralateral hemisphere. Previous attempts to illustrate right hemispheric contributions to the control of aiming have focussed on increasing the spatial demands of an aiming task, to attenuate the typical right hand advantages, (...) to try to enhance a left hand reaction time advantage in right-handed participants. These early attempts have not been successful. The present study circumnavigates some of the theoretical and methodological difficulties of some of the earlier experiments, by using three different tasks linked directly to specialized functions of the right hemisphere: bisecting, the gap effect, and visuospatial localization. None of these tasks were effective in reducing the magnitude of left hand reaction time advantages in right handers. Results are discussed in terms of alternatives to right hemispheric functional explanations of the effect, the one-dimensional nature of our target arrays, power and precision given the size of the left hand RT effect, and the utility of examining the proportions of participants who show these effects, rather than exclusive reliance on measures of central tendency and their associated null hypothesis significance tests. (shrink)

Researchers typically attempt to fulfill disclosure and informed consent requirements by having participants read and sign consent forms. The present study evaluated the reading levels of informed consent forms used in psychology research and other fields (medical research; social science and education research; and health, physical education, and recreation research). Two standardized measures of readability were employed to analyze a randomly selected sample (N = 108) of informed consent forms used in Institutional Review Board-approved research projects at a midwestern university (...) during the 1987-1988 academic year. Results indicate that informed consent forms are typically written at a higher reading level than is appropriate for the intended population and that there are no consistently significant differences in readability among areas of research or between college student and noncollege student participants. Due to the unacceptably high reading level of the consent forms, one must question whether participants can comprehend the information contained in the consent forms. (shrink)

In this paper, I examine some of the presuppositions that underpin the practice and interpretation of multi-person dialogue – that is, in contexts involving more than two interlocutors – with particular thought for the university seminar. I outline the ‘dialogical phenomenology’ of Beata Stawarska as useful on this count; however, I argue that Stawarska’s account is steeped in a philosophical ‘dyadic paradigm’ which has limiting consequences for practitioners of dialogue looking to understand the nature of dialogue in a group context. (...) Against this paradigm, I argue that there are many varieties of intersubjectivity that have not been widely discussed, including we-you, we-yous, I-yous and we-they intersubjective structures. I will look further at how an understanding of these structures is valuable for dialogue within educational praxes and for the Humanities more broadly. (shrink)

Objective: Persuasive messages regarding fruit and vegetable consumption often meet defensive reactions from recipients, which may lower message effectiveness. Individual differences in emotion regulation and gender are expected to predict these reactions. In the working memory account of persuasion, inducing voluntary eye movements during the processing of the auditory persuasive information might prevent defensiveness and thereby increase message effectiveness.Methods: Participants in two independently recruited samples from the general population listened to a negatively framed auditory persuasive message advocating fruit and vegetable (...) consumption. Half of them were asked to keep following a regularly moving stimulus on their screen with their eyes. At pretest, the individual differences of cognitive self-affirmation inclination and gender were assessed to predict defensive reactions.Results: In Study 1, induced eye movements significantly increased self-reported consumption after 2 weeks when CSAI was low, but only in males, as indicated by a significant three-way interaction. With negative self-evaluative emotions as dependent variable, this three-way interaction was also significant, suggesting that induced eye movements prevented defensiveness in low CSAI males. Study 2 did not assess consumption but replicated the latter three-way interaction.Conclusion: The studies replicated our earlier findings regarding the moderating effects of individual differences in emotion regulation on persuasion, but they also revealed gender differences in persuasion that are related to the working memory. The working memory account of persuasion provides new theoretical as well as practical angles on persuasion to target individuals in persuasion to increase fruit and vegetable consumption. (shrink)

Agricultural diversification in the Midwestern Corn Belt has the potential to improve socioeconomic and environmental outcomes by buffering farmers from environmental and economic shocks and improving soil, water, and air quality. However, complex barriers related to agricultural markets, individual behavior, social norms, and government policy constrain diversification in this region. This study examines farmer perspectives regarding the challenges and opportunities for both corn and soybean production and agricultural diversification strategies. We analyze data from 20 focus groups with 100 participants conducted (...) in Indiana, Illinois, and Iowa through a combined inductive and deductive approach, drawing upon interpretive grounded theory. Our results suggest that when identifying challenges and opportunities, participants center economics and market considerations, particularly income, productivity, and market access. These themes are emphasized both as benefits of the current corn-soybean system, as well as challenges for diversification. Additionally, logistical, resource and behavioral hurdles– including the comparative difficulty and time required to diversify, and constraints in accessing land, labor, and technical support– are emphasized by participants as key barriers to diversification. Agricultural policies shape these challenges, enhancing the comparative advantage and decreasing the risk of producing corn and soybeans as compared to diversified products. Meanwhile, alternative marketing arrangements, farmer networks, family relationships, and improved soil health are highlighted as important opportunities for diversification. We contextualize our findings within the theories of reasoned action and diffusion of innovation, and explore their implications for farmer engagement, markets, and agricultural policy, and the development of additional resources for business and technical support. (shrink)

Face-to-face meetings are often preferred over other forms of communication because meeting in person provides the “richest” way to communicate. Face-to-face meetings are so rich because many ways of communicating are available to support mutual understanding. With the progress of digitization and driven by the need to reduce personal contact during the global pandemic, many face-to-face work meetings have been shifted to videoconferences. With webcams turned on, video calls come closest to the richness of face-to-face meetings. However, webcam use often (...) remains voluntary, and some participants choose not to turn their cameras on. In order to find ways to support webcam use—when desired—we analyzed how social norms in groups affect the decision to activate a webcam in a specific meeting. Based on an online survey with N = 333 participants, we found that social norms are related to an individual’s decision to turn on the webcam, even when controlling for group size. If the number of participants with activated webcams in a university meeting increased by 25%, it was 5.92 times more likely that an individual decided to turn their webcam on, too. Furthermore, 81.84% of respondents indicated they would turn on their webcam if participants in a meeting were explicitly asked to do so. The results demonstrate a strong relation between social norms and the decision to activate a webcam in online meetings. They build a basis for enhancing webcam use and enable a greater richness of communication in online meetings. (shrink)

Environmental change requires individuals and institutions to facilitate adaptive governance. However, facilitating adaptive governance may be difficult because resource users' perceptions of desirable ways of life vary. These perceptions influence preferences related to environmental governance and may stem from the ways individuals subjectively value their work and their connections to their environment. This paper uses a value-based approach to examine individual and institutional preferences for adaptive governance in Carelmapu, Chile. We show that two groups had different value frames rooted in (...) divergent ontologies which influenced their actions related to adaptive governance, creating conflict. (shrink)

As the usual regulatory framework did not fit well during the last Ebola outbreak, innovative thinking still needed. In the absence of an outbreak, randomised controlled trials of clinical efficacy in humans cannot be done, while during an outbreak such trials will continue to face significant practical, philosophical, and ethical challenges. This article argues that researchers should also test the safety and effectiveness of novel vaccines in wild apes by employing a pluralistic approach to evidence. There are three reasons to (...) test vaccines in wild populations of apes: i) protect apes; ii) reduce Ebola transmission from wild animals to humans; and iii) accelerate vaccine development and licensing for humans. Data obtained from studies of vaccines among wild apes and chimpanzees may even be considered sufficient for licensing new vaccines for humans. This strategy will serve to benefit both wild apes and humans. (shrink)

This paper reviews the location of Responsible Research and Innovation approaches within the access and benefit sharing policy spaces of the Convention on Biological Diversity and Nagoya Protocol. We describe how a range of dialogues on ethical research practices found a home, almost inadvertently, within the ABS policy process. However, more recent RRI dialogues around emerging technologies have not been similarly absorbed into ABS policy, due in part to the original framing of ABS and associated definitional and scope issues. Consideration (...) is given to the challenges posed to these policy processes by the transformative and rapid nature of scientific and technological change today, including the emerging field of synthetic biology. Drawing on experiences from regulating ABS, we emphasize that the integration of RRI into policies for new, emerging, or poorly understood activities such as synthetic biology faces deficiencies such as limits to government capacity, jurisdictional confusion, shortages in funds, and an absence of strategic approaches. We conclude that a coordinated combination of diverse policy processes within the CBD might provide an invaluable space for RRI dialogues on social justice, sustainability, biosafety, and other issues raised by emerging technologies. (shrink)

It is usually supposed that the Dirac and radiation equations predict that the phase of a fermion will rotate through half the angle through which the fermion is rotated, which means, via the measured dynamical and geometrical phase factors, that the fermion must have a half-integral spin. We demonstrate that this is not the case and that the identical relativistic quantum mechanics can also be derived with the phase of the fermion rotating through the same angle as does the fermion (...) itself. Under spatial rotation and Lorentz transformation the bispinor transforms as a four-vector like the potential and Dirac current. Previous attempts to provide this form of transformational behavior have foundered because a satisfactory current could not be derived.(14). (shrink)

Anorexia Nervosa (AN) is widely considered to be a bodily disorder accompanied by unrealistic perceptions about one’s own body. Some researchers thus have wondered whether deficits in interoception, a conscious or non-conscious sense of one’s own body, could be a primary cause of AN. In this paper, we make the case that rather than interoception being a primary cause, deficits in interoception may occur as by-products of emotions that arise upstream in the pathogenesis of AN and interact with feelings of (...) a loss of self-control. We consider interoception, emotion, and self-control as a dynamical triad involved in the explanation of AN, with emotions as the central aspect of their interactions. We begin with a critical analysis of recent empirical literature on AN and differentiate three types of interoceptive processes. We then consider the role of self-control in AN. We go on to evaluate recent empirical and philosophical work on the role of emotions in AN and assess their importance in both interoception and self-control dynamics. We develop a testable integrative model that we believe best captures how self-control, emotional and interoceptive processes causally interact in the pathogenesis of AN. In this model, AN behaviors are not caused by interoceptive abnormalities, but rather interact with changes in emotional regulation and feelings of loss of self-control, subsequently leading to interoceptive deficits downstream. To capture a later stage in the pathogenesis of AN, we show how AN behaviors are maintained as a result of feedback among components in the model. We briefly explain future plans to further complement the model using a semi-structured interview to probe patient perspectives in AN. To develop a more valid understanding of AN, this model will have to be integrated into pluralistic approaches that include patient perspectives. (shrink)

We have shown in a previous paper that the Dirac bispinor can vary like a four-vector and that Quantum Electrodynamics can be reproduced with this form of behaviour. In Part I of this paper, we show that QED with the same transformational behaviour also holds in an alternative space we call M-space. We use the four-vector behaviour to model the two-body interaction in M and show that this has similar physical properties to the usual model in L which it predicts. (...) In Part II of this paper we use M-space to show that QED can be reduced to two simple rules for a two-body interaction. (shrink)

From self-cultivation to global justice, from environmental ethics to the interrelation of religion and science, this collection of essays highlights the central role of philosophy, and comparative philosophy in particular, for understanding and appreciating the connections and discontinuities of East and West.

The study of emotional intelligence and its relationship with the dark triad has emerged as a popular research area. However, the complex nature of the dark triad and EI, including multiple me...

Mastery imagery (i.e., images of being in control and coping in difficult situations) is used to regulate anxiety. The ability to image this content is associated with trait confidence and anxiety, but research examining mastery imagery ability's association with confidence and anxiety in response to a stressful event is scant. The present study examined whether trait mastery imagery ability mediated the relationship between confidence and anxiety, and the subsequent associations on performance in response to an acute psychological stress. Participants (N= (...) 130; 55% male;Mage= 19.94 years;SD= 1.07 years) completed assessments of mastery imagery ability and engaged in a standardized acute psychological stress task. Immediately prior to the task, confidence, cognitive and somatic anxiety intensity, and interpretation of anxiety symptoms regarding the task were assessed. Path analyses supported a model whereby mastery imagery ability mediated the relationship between confidence and cognitive and somatic anxiety interpretation. Greater mastery imagery ability and confidence were both directly associated with better performance on the stress task. Mastery imagery ability may help individuals experience more facilitative anxiety and perform better during stressful tasks. Improving mastery imagery ability by enhancing self-confidence may help individuals successfully cope with anxiety elicited during stressful situations. (shrink)

We complete our previous(1, 2) demonstration that there is a family of new solutions to the photon and Dirac equations using spatial and temporal circles and four-vector behaviour of the Dirac bispinor. We analyse one solution for a bound state, which is equivalent to the attractive two-body interaction between a charged point particle and a second, which remains at rest. We show this yields energy and angular momentum eigenvalues that are identical to those found by the usual method of solving (...) of the Dirac equation,(4) including fine structure. We complete our previous derivation(2) of QED from a set of rules for the two-body interaction and generalise these. We show that QED may be decomposed into a two-body interaction at every point in spacetime. (shrink)

We often think about the alternatives to a decision that has been made. Thinking in this way is known as counterfactual thinking, that is, thinking about what could have been had an alternative dec...

This article engages the question—what is the right business‐society relationship? We consider three perspectives that seek to address the relationship: corporate social responsibility (CSR), social entrepreneurship (SE), and conscious capitalism (CC). We take a macroapproach considering how commentary about these approaches establishes a direction for corporate practice and its relationship to key stakeholder groups. We argue that these perspectives are ‘D'iscourses that provide arguments for and articulations about the direction of corporate practice and the business‐society relationship. To organize our review (...) of each perspective, and focus our critique, for each we highlight (a) drivers and influencers, (b) core assumptions and defining features, and (c) approaches and exemplars. Although distinct, all emphasize effective business practices as key to meeting social needs. CSR suggests legitimizing business practice; SE relocates business practices; and CC seeks to reimagine/rehabilitate business for social good. Ultimately, we conclude that these Discourses lack a clear communicative focus in terms of decision making within these organizations. We attend to this and other implications, and offer avenues for further research. (shrink)

Organisations have implemented intensive home-based teleworking in response to global COVID-19 lockdowns and other pandemic-related restrictions. Financial pressures are driving organisations to continue intensive teleworking after the pandemic. Understanding employees’ teleworking inclinations post COVID-19, and how these inclinations are influenced by different factors, is important to ensure any future, more permanent changes to teleworking policies are sustainable for both employees and organisations. This study, therefore, investigated the relationships between the context of home-based teleworking during the pandemic, productivity perceptions during home-based (...) teleworking, and employees’ future teleworking inclinations beyond the pandemic. Specifically, the study examined whether pandemic-teleworking conditions related to the job, and the physical and social environments at home, influenced employees’ FTI, and if perceptions of improved or reduced productivity mediated these relationships. Data were collected during April and May 2020 with a cross-sectional online survey of teleworkers in Germany, Switzerland, the United Kingdom, and other countries during the first COVID-19 lockdowns. Reported FTI were mixed. Most participants reported wanting to telework more post-pandemic compared to before the pandemic; however, 18% wanted to telework less. Hierarchical multiple regression analysis revealed that some teleworking conditions were positively associated with FTI. Other teleworking conditions were not associated with FTI. Perceived changes in productivity mediated the relationship between work privacy fit and FTI. Findings highlight the role of work privacy fit and job demands in influencing pandemic productivity perceptions and teleworking inclinations post-pandemic. Results raise questions about the suitability and sustainability of home-based teleworking for all staff. As organisations plan to increase the proportion of teleworking post-pandemic, this study suggests there is a need to support employees who perceived their productivity to be poor while home-working during the pandemic. (shrink)

What do human beings use conditional reasoning for? A psychological consequence of counterfactual conditional reasoning is emotional experience, in particular, regret and relief. Adults’ thoughts about what might have been influence their evaluations of reality. We discuss recent psychological experiments that chart the relationship between children’s ability to engage in conditional reasoning and their experience of counterfactual emotions. Relative to conditional reasoning, counterfactual emotions are late developing. This suggests that children need not only competence in conditional reasoning, but also to (...) engage in this thinking spontaneously. Developments in domain general cognitive processing (the executive functions) allow children to develop from conditional reasoning to reasoning with counterfactual content and, eventually, to experiencing counterfactual emotions. (shrink)

Theories of cognitive development must address both the issue of how children bring their knowledge to bear on behavior in‐the‐moment, and how knowledge changes over time. We argue that seeking answers to these questions requires an appreciation of the dynamic nature of the developing system in its full, reciprocal complexity. We illustrate this dynamic complexity with results from two lines of research on early word learning. The first demonstrates how the child's active engagement with objects and people supports referent selection (...) via memories for what objects were previously seen in a cued location. The second set of results highlights changes in the role of novelty and attentional processes in referent selection and retention as children's knowledge of words and objects grows. Together this work suggests that understanding systems for perception, action, attention, and memory, and their complex interaction, is critical to understand word learning. We review recent literature that highlights the complex interactions between these processes in cognitive development and point to critical issues for future work. (shrink)

ObjectiveTo increase knowledge of how doctors perceive futile treatments and scarcity of resources at the end of life. In particular, their perceptions about whether and how resource limitations influence end-of-life decision making. This study builds on previous work that found some doctors include resource limitations in their understanding of the concept of futility.SettingThree tertiary hospitals in metropolitan Brisbane, Australia.DesignQualitative study using in-depth, semistructured, face-to-face interviews. Ninety-six doctors were interviewed in 11 medical specialties. Transcripts of the interviews were analysed using thematic (...) analysis.ResultsDoctors’ perceptions of whether resource limitations were relevant to their practice varied, and doctors were more comfortable with explicit rather than implicit rationing. Several doctors incorporated resource limitations into their definition of futility. For some, availability of resources was one factor of many in assessing futility, secondary to patient considerations, but a few doctors indicated that the concept of futility concealed rationing. Doctors experienced moral distress due to the resource implications of providing futile treatment and the lack of administrative supports for bedside rationing.ConclusionsDoctors’ ability to distinguish between futility and rationing would be enhanced through regulatory support for explicit rationing and strategies to support doctors’ role in rationing at the bedside. Medical policies should address the distinction between resource limitations and futility to promote legitimacy in end-of-life decision making. (shrink)

Theories of cognitive development must address both the issue of how children bring their knowledge to bear on behavior in-the-moment, and how knowledge changes over time. We argue that seeking answers to these questions requires an appreciation of the dynamic nature of the developing system in its full, reciprocal complexity. We illustrate this dynamic complexity with results from two lines of research on early word learning. The first demonstrates how the child's active engagement with objects and people supports referent selection (...) via memories for what objects were previously seen in a cued location. The second set of results highlights changes in the role of novelty and attentional processes in referent selection and retention as children's knowledge of words and objects grows. Together this work suggests that understanding systems for perception, action, attention, and memory, and their complex interaction, is critical to understand word learning. We review recent literature that highlights the complex interactions between these processes in cognitive development and point to critical issues for future work. (shrink)

This paper advances the research on personalization of political communication by investigating whether this process of focusing on politicians instead of political issues plays a role on Twitter. Results of a content analysis of 5,530 tweets posted in the run-up to the German federal election provide evidence that Twitter communication refers more often to politicians than to issues. However, tweets containing personal characteristics about political leaders play only a marginal role. When distinguishing among different groups of actors on Twitter (journalists, (...) politicians, citizens), we find that citizens focus more on candidates than do journalists or politicians. Investigating the impact of a televised debate on Twitter communication, we observe that this person-centered event puts the focus on individual politicians instead of issues. (shrink)